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[PATCH v12 1/1] vhost-vdpa: add support for vIOMMU
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From: |
Cindy Lu |
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Subject: |
[PATCH v12 1/1] vhost-vdpa: add support for vIOMMU |
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Date: |
Fri, 9 Dec 2022 21:08:05 +0800 |
1.Skip the check in vhost_vdpa_listener_skipped_section() while
MR is IOMMU, Move this check to vhost_vdpa_iommu_map_notify()
2.Add support for vIOMMU.
Add the new function to deal with iommu MR.
- during iommu_region_add register a specific IOMMU notifier,
and store all notifiers in a list.
- during iommu_region_del, compare and delete the IOMMU notifier from the list
Verified in vp_vdpa and vdpa_sim_net driver
Signed-off-by: Cindy Lu <lulu@redhat.com>
---
hw/virtio/vhost-vdpa.c | 162 ++++++++++++++++++++++++++++++---
include/hw/virtio/vhost-vdpa.h | 10 ++
2 files changed, 161 insertions(+), 11 deletions(-)
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 7468e44b87..2b3920c2a1 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -26,6 +26,7 @@
#include "cpu.h"
#include "trace.h"
#include "qapi/error.h"
+#include "hw/virtio/virtio-access.h"
/*
* Return one past the end of the end of section. Be careful with uint64_t
@@ -60,15 +61,22 @@ static bool
vhost_vdpa_listener_skipped_section(MemoryRegionSection *section,
iova_min, section->offset_within_address_space);
return true;
}
+ /*
+ * While using vIOMMU, Sometimes the section will be larger than iova_max
+ * but the memory that actually mapping is smaller, So skip the check
+ * here. Will add the check in vhost_vdpa_iommu_map_notify,
+ *There is the real size that maps to the kernel
+ */
- llend = vhost_vdpa_section_end(section);
- if (int128_gt(llend, int128_make64(iova_max))) {
- error_report("RAM section out of device range (max=0x%" PRIx64
- ", end addr=0x%" PRIx64 ")",
- iova_max, int128_get64(llend));
- return true;
+ if (!memory_region_is_iommu(section->mr)) {
+ llend = vhost_vdpa_section_end(section);
+ if (int128_gt(llend, int128_make64(iova_max))) {
+ error_report("RAM section out of device range (max=0x%" PRIx64
+ ", end addr=0x%" PRIx64 ")",
+ iova_max, int128_get64(llend));
+ return true;
+ }
}
-
return false;
}
@@ -173,6 +181,115 @@ static void vhost_vdpa_listener_commit(MemoryListener
*listener)
v->iotlb_batch_begin_sent = false;
}
+static void vhost_vdpa_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
+{
+ struct vdpa_iommu *iommu = container_of(n, struct vdpa_iommu, n);
+
+ hwaddr iova = iotlb->iova + iommu->iommu_offset;
+ struct vhost_vdpa *v = iommu->dev;
+ void *vaddr;
+ int ret;
+ Int128 llend;
+
+ if (iotlb->target_as != &address_space_memory) {
+ error_report("Wrong target AS \"%s\", only system memory is allowed",
+ iotlb->target_as->name ? iotlb->target_as->name : "none");
+ return;
+ }
+ RCU_READ_LOCK_GUARD();
+ /* check if RAM section out of device range */
+ llend = int128_add(int128_makes64(iotlb->addr_mask), int128_makes64(iova));
+ if (int128_gt(llend, int128_make64(v->iova_range.last))) {
+ error_report("RAM section out of device range (max=0x%" PRIx64
+ ", end addr=0x%" PRIx64 ")",
+ v->iova_range.last, int128_get64(llend));
+ return;
+ }
+
+ vhost_vdpa_iotlb_batch_begin_once(v);
+
+ if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) {
+ bool read_only;
+
+ if (!memory_get_xlat_addr(iotlb, &vaddr, NULL, &read_only, NULL)) {
+ return;
+ }
+
+ ret = vhost_vdpa_dma_map(v, iova, iotlb->addr_mask + 1, vaddr,
+ read_only);
+ if (ret) {
+ error_report("vhost_vdpa_dma_map(%p, 0x%" HWADDR_PRIx ", "
+ "0x%" HWADDR_PRIx ", %p) = %d (%m)",
+ v, iova, iotlb->addr_mask + 1, vaddr, ret);
+ }
+ } else {
+ ret = vhost_vdpa_dma_unmap(v, iova, iotlb->addr_mask + 1);
+ if (ret) {
+ error_report("vhost_vdpa_dma_unmap(%p, 0x%" HWADDR_PRIx ", "
+ "0x%" HWADDR_PRIx ") = %d (%m)",
+ v, iova, iotlb->addr_mask + 1, ret);
+ }
+ }
+}
+
+static void vhost_vdpa_iommu_region_add(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+ struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener);
+
+ struct vdpa_iommu *iommu;
+ Int128 end;
+ int iommu_idx;
+ IOMMUMemoryRegion *iommu_mr;
+ int ret;
+
+ iommu_mr = IOMMU_MEMORY_REGION(section->mr);
+
+ iommu = g_malloc0(sizeof(*iommu));
+ end = int128_add(int128_make64(section->offset_within_region),
+ section->size);
+ end = int128_sub(end, int128_one());
+ iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
+ MEMTXATTRS_UNSPECIFIED);
+ iommu->iommu_mr = iommu_mr;
+ iommu_notifier_init(&iommu->n, vhost_vdpa_iommu_map_notify,
+ IOMMU_NOTIFIER_IOTLB_EVENTS,
+ section->offset_within_region, int128_get64(end), iommu_idx);
+ iommu->iommu_offset = section->offset_within_address_space -
+ section->offset_within_region;
+ iommu->dev = v;
+
+ ret = memory_region_register_iommu_notifier(section->mr, &iommu->n, NULL);
+ if (ret) {
+ g_free(iommu);
+ return;
+ }
+
+ QLIST_INSERT_HEAD(&v->iommu_list, iommu, iommu_next);
+ memory_region_iommu_replay(iommu->iommu_mr, &iommu->n);
+
+ return;
+}
+
+static void vhost_vdpa_iommu_region_del(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+ struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener);
+
+ struct vdpa_iommu *iommu;
+
+ QLIST_FOREACH(iommu, &v->iommu_list, iommu_next)
+ {
+ if (MEMORY_REGION(iommu->iommu_mr) == section->mr &&
+ iommu->n.start == section->offset_within_region) {
+ memory_region_unregister_iommu_notifier(section->mr, &iommu->n);
+ QLIST_REMOVE(iommu, iommu_next);
+ g_free(iommu);
+ break;
+ }
+ }
+}
+
static void vhost_vdpa_listener_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
@@ -187,6 +304,10 @@ static void vhost_vdpa_listener_region_add(MemoryListener
*listener,
v->iova_range.last)) {
return;
}
+ if (memory_region_is_iommu(section->mr)) {
+ vhost_vdpa_iommu_region_add(listener, section);
+ return;
+ }
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
(section->offset_within_region & ~TARGET_PAGE_MASK))) {
@@ -266,6 +387,9 @@ static void vhost_vdpa_listener_region_del(MemoryListener
*listener,
v->iova_range.last)) {
return;
}
+ if (memory_region_is_iommu(section->mr)) {
+ vhost_vdpa_iommu_region_del(listener, section);
+ }
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
(section->offset_within_region & ~TARGET_PAGE_MASK))) {
@@ -276,7 +400,8 @@ static void vhost_vdpa_listener_region_del(MemoryListener
*listener,
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
llend = vhost_vdpa_section_end(section);
- trace_vhost_vdpa_listener_region_del(v, iova, int128_get64(llend));
+ trace_vhost_vdpa_listener_region_del(v, iova,
+ int128_get64(int128_sub(llend, int128_one())));
if (int128_ge(int128_make64(iova), llend)) {
return;
@@ -303,9 +428,24 @@ static void vhost_vdpa_listener_region_del(MemoryListener
*listener,
vhost_iova_tree_remove(v->iova_tree, *result);
}
vhost_vdpa_iotlb_batch_begin_once(v);
+ /*
+ * The unmap ioctl doesn't accept a full 64-bit. need to check it
+ */
+ if (int128_eq(llsize, int128_2_64())) {
+ llsize = int128_rshift(llsize, 1);
+ ret = vhost_vdpa_dma_unmap(v, iova, int128_get64(llsize));
+ if (ret) {
+ error_report("vhost_vdpa_dma_unmap(%p, 0x%" HWADDR_PRIx ", "
+ "0x%" HWADDR_PRIx ") = %d (%m)",
+ v, iova, int128_get64(llsize), ret);
+ }
+ iova += int128_get64(llsize);
+ }
ret = vhost_vdpa_dma_unmap(v, iova, int128_get64(llsize));
if (ret) {
- error_report("vhost_vdpa dma unmap error!");
+ error_report("vhost_vdpa_dma_unmap(%p, 0x%" HWADDR_PRIx ", "
+ "0x%" HWADDR_PRIx ") = %d (%m)",
+ v, iova, int128_get64(llsize), ret);
}
memory_region_unref(section->mr);
@@ -597,7 +737,6 @@ static int vhost_vdpa_cleanup(struct vhost_dev *dev)
v = dev->opaque;
trace_vhost_vdpa_cleanup(dev, v);
vhost_vdpa_host_notifiers_uninit(dev, dev->nvqs);
- memory_listener_unregister(&v->listener);
vhost_vdpa_svq_cleanup(dev);
dev->opaque = NULL;
@@ -1115,7 +1254,8 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev,
bool started)
}
if (started) {
- memory_listener_register(&v->listener, &address_space_memory);
+ memory_listener_register(&v->listener, dev->vdev->dma_as);
+
return vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
} else {
vhost_vdpa_reset_device(dev);
diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h
index 1111d85643..0d5b2c9508 100644
--- a/include/hw/virtio/vhost-vdpa.h
+++ b/include/hw/virtio/vhost-vdpa.h
@@ -40,8 +40,18 @@ typedef struct vhost_vdpa {
void *shadow_vq_ops_opaque;
struct vhost_dev *dev;
VhostVDPAHostNotifier notifier[VIRTIO_QUEUE_MAX];
+ QLIST_HEAD(, vdpa_iommu) iommu_list;
+ IOMMUNotifier n;
} VhostVDPA;
+typedef struct vdpa_iommu {
+ struct vhost_vdpa *dev;
+ IOMMUMemoryRegion *iommu_mr;
+ hwaddr iommu_offset;
+ IOMMUNotifier n;
+ QLIST_ENTRY(vdpa_iommu) iommu_next;
+} VDPAIOMMUState;
+
int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size,
void *vaddr, bool readonly);
int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova, hwaddr size);
--
2.34.3